Buggy code:
public class GeneratorJava extends Generator implements PluggableNotation { private static GeneratorJava SINGLETON = new GeneratorJava ( ) ; public static GeneratorJava getInstance ( ) { } public GeneratorJava ( ) { } public static String Generate ( Object o ) { } public static String GenerateFile ( MClassifier cls , String path ) { } public String generateHeader ( MClassifier cls , String pathname , String packagePath ) { } public String generateOperation ( MOperation op , boolean documented ) { } public String generateAttribute ( MAttribute attr , boolean documented ) { } public String generateParameter ( MParameter param ) { } public String generatePackage ( MPackage p ) { } StringBuffer generateClassifierStart ( MClassifier cls ) { } StringBuffer appendClassifierEnd ( StringBuffer sbPrefix , MClassifier cls , boolean fPlain ) { } public String generateClassifier ( MClassifier cls ) { } public String generateMethodBody ( MOperation op ) { } public String generateDefaultReturnStatement ( MClassifier cls ) { } public String generateTaggedValues ( MModelElement e ) { } public String generateTaggedValue ( MTaggedValue tv ) { } public String generateConstraintEnrichedDocComment ( MModelElement me , MAssociationEnd ae ) { } public String generateConstraintEnrichedDocComment ( MModelElement me ) { String sDocComment = DocumentationManager . getDocs ( me ) ; if ( sDocComment != null ) { for ( int i = sDocComment . indexOf ( '\n' ) ; ( i >= 0 ) && ( i < ( sDocComment . length ( ) ) ) ; i = sDocComment . indexOf ( '\n' , ( i + 1 ) ) ) { sDocComment = ( ( sDocComment . substring ( 0 , ( i + 1 ) ) ) + ( INDENT ) ) + ( sDocComment . substring ( ( i + 1 ) ) ) ; } } Collection cConstraints = me . getConstraints ( ) ; if ( ( cConstraints . size ( ) ) == 0 ) { return sDocComment != null ? sDocComment : "" ; } if ( sDocComment != null ) { sDocComment = sDocComment . substring ( 0 , ( ( sDocComment . indexOf ( "*//" ) ) + 1 ) ) ; } else { sDocComment = ( ( ( ( ( INDENT ) + "//**\n" ) + ( INDENT ) ) + "<seq2seq4repair_space>*<seq2seq4repair_space>\n" ) + ( INDENT ) ) + "<seq2seq4repair_space>*" ; } class TagExtractor extends DepthFirstAdapter { private LinkedList m_llsTags = new LinkedList ( ) ; private String m_sConstraintName ; private int m_nConstraintID = 0 ; public TagExtractor ( String sConstraintName ) { } public Iterator getTags ( ) { return m_llsTags . iterator ( ) ; } public void caseAConstraintBody ( AConstraintBody node ) { String sKind = ( ( node . getStereotype ( ) ) != null ) ? node . getStereotype ( ) . toString ( ) : null ; String sExpression = ( ( node . getExpression ( ) ) != null ) ? node . getExpression ( ) . toString ( ) : null ; <START_BUG> String sName = ( ( node . getName ( ) ) != null ) ? node . getName ( ) . getText ( ) : ( ( m_sConstraintName ) + "_" ) + ( ( m_nConstraintID ) ++ ) ; <END_BUG> if ( ( sKind == null ) || ( sExpression == null ) ) { return ; } String sTag ; if ( sKind . equals ( "inv<seq2seq4repair_space>" ) ) { sTag = "@invariant<seq2seq4repair_space>" ; } else if ( sKind . equals ( "post<seq2seq4repair_space>" ) ) { sTag = "@postcondition<seq2seq4repair_space>" ; } else if ( sKind . equals ( "pre<seq2seq4repair_space>" ) ) { sTag = "@precondition<seq2seq4repair_space>" ; } else { return ; } sTag += ( sName + ":<seq2seq4repair_space>" ) + sExpression ; m_llsTags . addLast ( sTag ) ; } } ModelFacade mf = new org . argouml . ocl . ArgoFacade ( me ) ; for ( Iterator i = cConstraints . iterator ( ) ; i . hasNext ( ) ; ) { MConstraint mc = ( ( MConstraint ) ( i . next ( ) ) ) ; try { OclTree otParsed = OclTree . createTree ( mc . getBody ( ) . getBody ( ) , mf ) ; TagExtractor te = new TagExtractor ( mc . getName ( ) ) ; otParsed . apply ( te ) ; for ( Iterator j = te . getTags ( ) ; j . hasNext ( ) ; ) { sDocComment += ( ( ( "<seq2seq4repair_space>" + ( j . next ( ) ) ) + "\n" ) + ( INDENT ) ) + "<seq2seq4repair_space>*" ; } } catch ( IOException ioe ) { } } sDocComment += "//" ; return sDocComment ; } public String generateConstraints ( MModelElement me ) { } public String generateConstraint ( MConstraint c ) { } public String generateAssociationFrom ( MAssociation a , MAssociationEnd ae ) { } public String generateAssociation ( MAssociation a ) { } public String generateAssociationEnd ( MAssociationEnd ae ) { } public String generateGeneralization ( Collection generalizations ) { } public String generateSpecification ( MClass cls ) { } public String generateClassList ( Collection classifiers ) { } public String generateVisibility ( MVisibilityKind vis ) { } public String generateVisibility ( MFeature f ) { } public String generateScope ( MFeature f ) { } public String generateAbstractness ( MOperation op ) { } public String generateChangeability ( MOperation op ) { } public String generateChangability ( MStructuralFeature sf ) { } public String generateMultiplicity ( MMultiplicity m ) { } public static final String ANY_RANGE = "0..*" ; public String generateMultiplicityRange ( MMultiplicityRange mr ) { } public String generateState ( MState m ) { } public String generateStateBody ( MState m ) { } public String generateTransition ( MTransition m ) { } public String generateAction ( MAction m ) { } public String generateGuard ( MGuard m ) { } public String generateMessage ( MMessage m ) { }

Fix:
String sName = ( ( node . getName ( ) ) != null ) ? node . getName ( ) . getText ( ) . toString ( ) : ( ( m_sConstraintName ) + "_" ) + ( ( m_nConstraintID ) ++ ) ;